What is WMV?
Windows Media Video (WMV) is a compressed video file format for several proprietary
codecs developed by Microsoft. The original codec, known as WMV, was originally
designed for Internet streaming applications, as a competitor to RealVideo. The
other codecs, such as WMV Screen and WMV Image, cater for specialized content.
Through standardization from the Society of Motion Picture and Television Engineers
(SMPTE), WMV has gained adoption for physical-delivery formats such as HD DVD
and Blu-ray Disc.

What is SWF?
SWF (acronym of "Shockwave Flash", pronounced swiff) is a partially
open file format for multimedia and especially vector graphics developed by FutureWave
Software, and now controlled by Adobe. Intended to be small enough for publication
on the web, SWF files can contain animations or applets of varying degrees of
interactivity and function. SWF is also sometimes used for creating animated display
graphics and menus for DVD movies, and television commercials. SWF is currently
the dominant format for displaying animated vector graphics on the web, far exceeding
the W3C open standard SVG, which has met with problems over competing implementations.